Code Definition

U011D (00-0A) — Lost Communication with All Wheel Drive Control Module

System: Network Communication  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About U011D

U011D is a generic (obd-ii standard) network communication diagnostic trouble code. It belongs to the U-prefix family of codes, which covers inter-module network communication (CAN, LIN, FlexRay, or similar) faults.

Scanning & clearing: Network (U) codes report communication faults between modules. When diagnosing U-codes, checking the vehicle's CAN bus integrity, supply/ground at each module, and reading all modules for related faults is usually the first step.

Because U011D is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Powertrain Control Module (PCM) and other networked control modules communicate with the All Wheel Drive (AWD) control module over the Controller Area Network (CAN) bus to coordinate torque distribution, traction events, and driveline state. DTC U011D (sub codes 00 to 0A) is set when one or more receiving modules detect that expected CAN messages from the AWD control module are completely missing for a calibrated period of time, indicating a total loss of communication with the AWD module rather than a corrupted message. When this code is active the driver may experience the AWD warning la...

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